using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
using Microsoft.Practices.Prism.Regions;

namespace DTS.Common
{
    public class ViewerStackPanelRegionAdapter : RegionAdapterBase<StackPanel>
    {

        public ViewerStackPanelRegionAdapter(IRegionBehaviorFactory regionBehaviorFactory)
            : base(regionBehaviorFactory)
        {
        }

        protected override void Adapt(IRegion region, StackPanel regionTarget)
        {
            if (region == null) return;

            region.Views.CollectionChanged += (sender, e) =>
            {
                switch (e.Action)
                {
                    case NotifyCollectionChangedAction.Add:

                        foreach (UIElement element in e.NewItems)
                        {
                            regionTarget.Children.Add(element);
                        }
                        break;

                    case NotifyCollectionChangedAction.Remove:

                        foreach (UIElement elementLoopVariable in e.OldItems)
                        {
                            var element = elementLoopVariable;

                            if (regionTarget.Children.Contains(element))
                            {
                                regionTarget.Children.Remove(element);
                            }
                        }
                        break;
                }
            };
        }

        protected override IRegion CreateRegion()
        {
            return new AllActiveRegion();
        }
    }

}